Brake shoe



Sept. 19, 1933. w, WlNTERS BRAKE SHOE Filed NOV. 2, 1932 2 Sheets-Sheet l INVENTOR. ll $411 102% BY 72 wax ATTORNEY w. H. WINTERS 1,927,251

BRAKE SHOE Filed Nov. 2, 1932 2 Sheets-Sheet 2 INVENTOR. flaw rwzaw BY W ATTORNEY M H 4w? Z 2 W m V 4/ P M m, x m ,7

Sept. 19, 1933.

Patented Sept. 19, 1933 BRAKE SHOE Wilbur H. Winters, Larchmont, N. Y.,

signor to The American Brake Shoe and Foundry Company, Wilmington, Del., a corporation of Delaware Application November 2, 1932. Serial No. 640,836

4 Claims.

This invention relates to brake shoes of that type which includes a reenforce back embedded in the body of the shoe at the back thereof to hold the parts of the body together in case of fracture.

The object of the invention is to provide a novel back for a brake shoe which can be made in a rolling operation, which is rigid in structure, strong and substantial, and which will resist the stresses, strains and fatigue to which it is subjected particularly after the body is fractured to hold the parts of the body together until the shoe is worn out.

In the accompanying drawings I have shown selected embodiments of the invention and referring thereto,

Fig. l is a plan view of the inner side of a re enforce back with the body indicated in broken lines.

Fig. 2 is a longitudinal sectional view of the shoe.

Figs. 3 and 4 are transversesectional views on the lines 33 and 4-4 respectively of Fig. 2.

Figs. 5 to 19 are transverse sectional views showing other forms of the back.

Referring to the drawings, the body 11 of the shoe may be solid cast iron, as shown, or it may have inserts embedded therein in any form of composite shoe and. the reenforce is embedded therein at the back of the shoe when the body is cast thereon. I have shown the shoe provided with the usual attaching lug which comprises the lug strap 12 having inturned ends 13 engaged with the side margins of the back and the body metal extending up to form projections 14 enclosing the sides of the strap. The reenforce back consists of a strip of ductile metal preferably made in a rolling operation and it is slightly shorter and narrower than the body and is bent arcuately to correspond with the curvature of the body. I

Referring to Figs. 1 to 4, the reenforce back 15 has a central longitudinal depressed panel 16' and raised side margins 17 which extend throughout the length of the back. Ribs 18 are provided on the inner sideof the back at the edges of the panel to strengthen the back.

In Fig. 5 the inner side 19 of the depressed panel is made wider than the outer side 20 which provides thick sections 21 at the sides of the panel constituting ribs whichstrengthen the back like the ribs 18.

In Fig. 6 the back has a single strengthening rib 22 located centrally of the panel on the inner side of the back and in Fig. 7 the back is provided with side ribs 23 and a central rib 24 on the inner side of the panel; in Fig. 8 the back has a central rib 25 on the outer side of the panel; in Fig. 9 the back is thickened centrally of the depressed panel to form an outer rib 26 and an inner rib 27; and in Fig. 10 the back is provided with side ribs 28 and a central rib 29 on the inner side of the panel and with a central rib 30. on the outer side of the panel. The backs may be provided with openings 31 to permit the body metal to flow thereinto and the side edges 32 of the back are preferably beveled to receive the metal of the body in the casting operation for anchoring the body to the back. The depressed panel is preferably shorter than the side margins of the back, as shown in Fig. 1, to facilitate the flow of body metal for forming the lugs 33 at the ends of the shoe in the casting operation and to provide substantial anchorage for these lugs to the body.

When the body of a brake shoe fractures in actual service, as it frequently does, the parts are held together by the back so that the shoe may continue in use and give efficient service; but this condition subjects the back to excessive stresses and strains due to the constant vibration to which the shoe is subjected and these vibrations result in the fatigue of metal and the back sometimes breaks before the body of the shoe has worn out. My invention provides a back of novel construction which will outlast the body and continue to hold the parts of a fractured body together until the shoe has reached its limit of wear.

I have shown the invention in a common cast iron car shoe and in several embodiments but I reserve the right to embody the invention 'in any brake shoe to which it is or may be adapted and to make any changes in the form, construction and arrangement of parts within the scope of the following claims.

I claim:

1. A brake shoe comprising a body, and. a reenforce back embedded in the body, said back having a central longitudinal panel depressed therein from its outer side and an integral strengthening rib on said panel.

2. A brake shoe comprising a body, and a reenforce back embedded in the body, said back having a central longitudinal panel depressed therein from its outer side and strengthening ribs on the inner side of the back at the side edges of said panel.

3. A brake shoe comprising a body, and a reenhaving a central longitudinal panel depressed therein from its outer side and integral strengthening ribs on the inner and outer sides of the panel between its side edges.

WILBUR H. WINTERS. 

